chore(version): update ag-grid version to 0.5.1.dev0

Author: mofojed

plugins/ag-grid/setup.cfg

@@ -3,7 +3,7 @@ name = deephaven-plugin-ag-grid
 description = Deephaven AG Grid Plugin
 long_description = file: README.md
 long_description_content_type = text/markdown
-version = 0.5.1
+version = 0.5.1.dev0
 url = https://github.com/deephaven/deephaven-plugins
 project_urls =
     Source Code = https://github.com/deephaven/deephaven-plugins